How should I know I need to replace my lenovo yoga tablet 2-830l battery?

To check the lenovo yoga tablet 2-830l battery status, do either of the following:
• Approximate information about the battery status
Get the approximate status of the lenovo yoga tablet 2-830l battery at any time by checking the lenovo yoga tablet 2-830l battery status icon on the system bar in the upper-right corner of the screen. The shorter the green bar is, the less the battery power remains
• Accurate information about the battery status
To get the accurate information about the lenovo yoga tablet 2-830l battery status, do the following:
1. Open the Android Settings screen.
To open the Android Settings screen, do either of the following:
– From the main Home screen, touch the Android Settings icon on Lenovo Launch Zone. The Android Settings screen is displayed.
– Pull down the application icon from the action bar and then touch Settings. The Android Settings screen is displayed.
2. Touch Battery in the Device section on the Android Settings screen.
3. The accurate percentage of the remaining battery power is shown on the screen. Source from manual.

If your lenovo yoga tablet 2-830l battery is proved failed, you may take our product into consideration,

Voltage: 3.75V
Capacity: 6400mAh (24Wh)
Battery cells: 2-cell
Chemical: Li-ion
Battery Color: black
Condition: new original battery
Warranty: 9 months